Cannot open database "database" requested by the login

We have a back end procedure that inserts/updates records in a table. Usually the upload file will have around 20k records. This procedure is called from our application which is designed using hibernate,struts.

Upload is getting completed. But after the upload is over and control goes to application code, we are again hitting the above table to get some details. Is this the root cause for the below issue?

This is what we get in application logs,

SQL Error: 4060, SQLState: S1000
2007-04-30 16:17:27,840 - ERROR [TP-Processor2] JDBCExceptionReporter.logExceptions(58) | Cannot open database "sdgebis" requested by the login. The login failed.
2007-04-30 16:17:27,840 - WARN [TP-Processor2] JDBCExceptionReporter.logExceptions(57) | SQL Error: 18456, SQLState: 28000
2007-04-30 16:17:27,840 - ERROR [TP-Processor2] JDBCExceptionReporter.logExceptions(58) | Login failed for user 'sa'.

2007-04-30 16:17:27,856 - WARN [TP-Processor2] SQLErrorCodeSQLExceptionTranslator.translate(279) | Unable to translate SQLException with errorCode '4060', will now try the fallback translator

What could be the reason for the above error?

Can anyone help me out please?Sounds like the two connections use different logins. And only one of them is mapped to a user in the database.